Compilare: user.cpp: In function ‘int get()’: user.cpp:23:46: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] while(buff[pos]<'0' || buff[pos]>'9') nxt; ^ user.cpp:26:12: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] nxt; ^ user.cpp: In function ‘int main()’: user.cpp:109:32: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("bal.in","r",stdin); ^ user.cpp:110:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("bal.out","w",stdout); ^ user.cpp: In function ‘void solve()’: user.cpp:81:51: warning: ‘node’ may be used uninitialized in this function [-Wmaybe-uninitialized] for(unsigned int i=0;i<l[!ind][node].size();i++) ^